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50 years experience
Manufactured in Great Britain
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Pressure Treated Duke Grandmaster Summerhouse

Free Anti-Rot Treatment - Guaranteed for 15 years*
  • Extra STRONG
  • EXTRA TALL
  • UK Manufactured By Us
  • Multiple Design Options
  • Fully Pressure Treated*
  • Free UK Delivery*
  • Assembly time is 4x faster than a log cabin!

From £41.83 / month

I Choose your treatment

  • Standard Dip Treatment
  • FREE PRESSURE TREATMENT
    WORTH
In stock
Mortice lock and lockable windows
Extra tall inside
Stronger and taller double doors
16mm cladding upgrade
15 year anti rot guarantee
Fully opening windows

Disclaimer : Painted buildings are for illustration purposes only. All buildings are in their standard or pressure treated colour upon delivery. A distance of 1m must be kept between the boundary and your building to allow access for annual treatment and to comply with the anti-rot guarantee.

High Quality Materials

Thicker & doubled up timber framing with shiplap construction.

15 year Anti Rot Guarantee*

Pressure treated to protect against fungal decay and rot.

Fits through a standard door

Modular sections that fit through your door and make assembly easier.

Hand Crafted

Grandmaster is built by our fully trained product assembly team using hand-selected graded scandinavian slow grown timber at our facility in Nottinghamshire, in the cusp of Sherwood Forest.

All of products are picked, checked and packed for delivery making sure everything meets our high standards.

We do the hard work for you

Grandmaster comes with pre-assembled panels which we build in house and check before it’s delivered to your door. Making the installation of Grandmaster easier for you or your installer, whilst saving you time and money.

Alongside this we have created a set of easy to follow instructions which are sent out with every building, making your Grandmaster experience a pleasant one.

Build Grandmaster to your specification

Just like the Evolution, the Grandmaster is built up of modular panels. Meaning that you can customise your building to your needs. Choose from base-coated or pressure treated finsh which comes with a 15 year anti-rot guarantee*. Upgrades from external cladding thickness (11mm or 16mm) to flooring thickness (11mm, 19mm or 28mm) providing a stonger base for heavier applications. You have two glazing options with Grandmaster the first being styrene forseasonal use or double glazing to enjoy your Grandmaster all year round. For extra protection we can upgrade you to a rubber roof protecting your outdoor building up to 50 years.

Start creating your Grandmaster today

At Project Timber, we aim to provide you with the best customer experience as possible. We want to help you find the perfect outdoor building, exactly the way you want it

Choose from one of the sizes we offer. Our Traditional Windowed 2 Doors Grandmaster Workshop Shed comes with the following as standard –
 
Included
 

High quality materials

We only use the very best materials for our garden buildings.
 
Included
 

10 year anti-rot guarantee

Peace of mind that your building will stand proud for years.
 
Included
 

Longer lasting

Our buildings are designed to last.
 
Included
 

Thicker and doubled up framing

27mm x 44mm panel framing – thicker than standard. Key supports are doubled up to 54mm for extra support.
 
Included
 

Fully braced doors

  • Open fully for extra comfort
  • Extra high for more headroom
  • Fully braced for increased strength
 
Included
 

Mortice lock and lockable windows

Extra high security with a three lever lock to keep your belongings safe.
 
Included
 

Extra tall interior

  • 2.3m ridge height for 8ft range
  • 2.4m ridge height for 10ft / 12ft
  • Room for taller items
  • A comfortable space for all day use
 
Included
 

Extra strong, double sided roof trusses

Extra support to maximise the roof strength.
2

Thickness

Easy and strong tongue and groove construction

Our shiplap panels keep rainwater and other harsh elements from entering the building. This is primarily due to its construction where the panels closely interlock, leaving no space for water penetration and weather damage.
Included
 

11mm shiplap

Tongue & groove

Upgrade

16mm shiplap

Tongue & groove

3

Floor

5

Roof cover

A choice of roof covers for your preference and budget

Included
 

Mineral felt

Upgrade

Black roof tiles

Upgrade

Grey roof tiles

Upgrade

Green roof tiles

Select Size
Select Measurements
Metric
Imperial
Overall Dimensions
Overall Width
Value
Overall Depth
Value
Width Internal
Value
Depth Internal
Value
Eaves & Ridge
Eaves Height Inc. Floor
Value
Eaves Height Excl. Floor
Value
Ridge Height Inc. Floor
Value
Ridge Height Excl. Floor
Value
Eaves Height Internal
Value
Ridge Height Internal
Value
Features
Windows
Value
Shed Type
Value
BillyOh Range
Value
Roof Style
Value
Fixtures & Fittings
Value
Cladding Style
Value
Locking System
Value
Interchangeable Windows
Value
Basecoat Treatment
Value
Pre-Assembled Side Panels
Value
Select options
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  • Size
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  • Wall Thickness
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  • Fixing Option
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  • Windows Style
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  • Floor
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  • Roof Cover
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  • Paint Colour
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  • Colour Trim
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